11.4.2 Derating for Altitude
The cooling capability of air is decreased at a lower air
pressure.
Below 3,300 ft [1000 m] altitude no derating is necessary
but above 3,300 ft [1000 m] the ambient temperature
(T
AMB
) or max. output current (I
out
) should be derated in
accordance with
An alternative is to lower the ambient temperature at high
altitudes and thereby ensure 100% output current at high
altitudes. As an example of how to read the graph, the
situation at 6,600 ft [2 km] is elaborated. At a temperature
of 113°F [45
°
C] (T
AMB, MAX
- 3.3 K), 91% of the rated output
current is available. At a temperature of 107°F [41.7
°
C],
100% of the rated output current is available.
Altitude Derating
Derating of output current versus altitude at T
AMB, MAX
for
frame sizes D, E and F.
80
0
500
100
95
90
85
1000
1500
2000
2500
3000
Altitude (meters above sea level)*
130BB008.10
I
OUT
(%)
Figure 11.7 Altitude Derating
11.5 Fuses
Danfoss recommends using fuses and/or circuit breakers
on the supply side as protection in case of component
break-down inside the adjustable frequency drive (first
fault).
NOTICE!
Using fuses and/or circuit breakers ensures compliance
with IEC 60364 for CE or NEC 2009 for UL.
Branch Circuit Protection
To protect the installation against electrical and fire hazard,
all branch circuits in an installation, switch gear, machines,
etc., must be protected against short-circuit and
overcurrent according to national/international regulations.
NOTICE!
The recommendations do not cover branch circuit
protection for UL.
Short-circuit protection
Danfoss recommends using the fuses/circuit breakers in
to protect service personnel and
property in case of component breakdown in the
adjustable frequency drive.
11.5.1 Non- UL compliance
Non- UL compliance
If UL/cUL is not to be complied with, Danfoss recommends
using the following fuses, which ensures compliance with
EN50178:
P132–P200
380–500 V
type gG
P250–P400
380–500 V
type gR
Table 11.7 Recommended Fuses for non-UL Applications
Specifications
Instruction Manual
164
Danfoss A/S © Rev. 2014-02-07 All rights reserved.
MG37A222
11
11
Summary of Contents for VLT AutomationDrive FC 302
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